I’m not sure what to say then. When I first installed it a few months ago it worked fine. No new plugins have been installed, and the theme has not changed.
I’ve even disabled ALL other plugins and it still does not work.
I looked at the post you linked, unfortunately his solution does not work for me as I have no .htaccess file in my /wp-content folder. Only the main one in the root which just has the normal WordPress code.